There are many bars to changing status and adjusting status, and overstaying the visa is not the only problem. Unlawful employment can create several problems when one seeks to adjust status in the US.
Unlawful employment occurs quite frequently when the line between being a visitor for business and actual employment is crossed. Situations where this commonly occurs for performers and athletes are one-time appearances for which remuneration is paid incorrectly, self-employment, or providing volunteer services for which bonuses are later intended to be paid once a legitimate visa is obtained.
Appearing on Jay Leno to promote a project is fine, but getting paid to host a segment of Disney Channel is probably not. Performing at weddings, bar mitzvahs, and parties is also a problem if you were paid, and it may be a problem if you received something “inkind.”
Visa Lawyer Blog

